Method of impregnating woven belts and conveying-bands.



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HANS WILLEAM ANDERSEN, OF ODENSE, DENMARK.

METHOD O13v IMPEEGNATIN'G- WOVEN BELTS AND GONVEYING-BANDS.

No ih'awing.

To 022 whom it may concern:

Be it known that I, Hans WILLIAM Anonasnn,'subject to the Kingdom of Denmark, and a resident of Sortebryfidretorvet Nos. 1921, Odense, Denmark, manager director, have invented new and useful 11nprovements in Methods of impregnating Woven Belts and Conveying-Bands, of which the following is a specification.

According to the methods hitherto used for impregnating woven power-belts and conveying bands, they have been saturated with oil, boiled linseed oil being considered the most suitable means for protecting woven belts and conveying bands against dampness and decomposition. Owing to. the viscosity of the linseed oil, it did not penetrate deeply into the fabric. The imperfect saturation of woven belts and con.- veying bands with oil may be easily ascertained by immersing them in water, when they will alter their length, which can only take place by their being saturated with water.

Attempts have already been made'to impregnate woven belts and conveying bands with balata instead of linseed oil (see German specification No. 561,946), but it was found that the balata solution, or rather the balata itself, was not able to penetrate into the belt, but only the solution liquid was absorbed, while the balataitself formed a layer on the surface of the fabric.

The won on belts impregnated with balata solution were found, after immersion in water, to have a greater alteration of length than those in'ipregnated with oil.

It was then found that asphalt solutions were very suitable for impregnating woven belts, especially solutions of asphalt of the elaterite, gilsonite, and unatite groups.

Furthermore, it was found that the hitherto used asphalt impregnation of woven belts could be improved by admixing balata solution to the asphalt solution used for impregnating. Impregnating with asphalt alone has the disadvantage that the asphalt cracks easily in cold weather. If, on the other hand, a mixture of asphalt and balata solution is used for impregnating, it is true that the balata does not pervir te nearly as far into the fabric as the as, Qt, but it prevents the belt from cracking in the winter and from becoming very sticky in the summer, and, what is still more important, a

Specification of Letters Patent.

belt impregnated with asphalt and -balata is perfectly air-tight and water-tight and, after suitable compression, becomes compact, and its length is then not altered by dampness. Neither does it rot, for asphalt is a powerfulv preventive against decomposition.

It is not absolutely necessary to dissolve asphalt and balata simultaneously and then to impregnate with the combined asphaltbalata solution, but the'belt may be impregnated first with asphalt solution and then, so to speak covered with balata solution. Since balata and asphalt can be dissolved by the same dissolvents, impregnating in two processes, first with asphalt and then with balata, therefore give just as good results and just as compact a union as impregnating with an asphalt-balata solution.

If the combined asphalt-balata solution is used, the impregnating can be well done with a compressed air paint-squirting device.

The woven belts impregnated with asphalt-balata solution increase the powertransmitting effect when used on slippery pulleys, since they are perfectly air-tight, and the consequent suction increases the adhesion, which is not the case with woven belts impregnated with oil or asphalt or unimpregnated woven belts.

Patented Mar. 6, 1917.

Application filed fictober 29, 1914. Serial No. 869,343.

The impregnation of Woven belts with asphalt seems to cause a closer union of the threads of the fabric, for the durability of the asphalted woven belts proves to be increased by 35%.

Instead of balata, guttapercha or some other similar substance may also be used.-

lVhat I claim, and desire to secure by Letters Patent, is:

1. The herein described process of treati' ing textile belting, consisting in first impregnating the web with a solution of asphalt and then coating the web with a layer of balata.

2. The herein described method of preparing textile belting consisting in treating the same with an asphalt solution and a rubberlike vegetable gum. .i

Signed by me at Copenhagen, Denmark, this 10th day of October, 1914.

HANS WILLIAM ANDERSEN.

Witnesses:

CHAS. HUDE, J. MABTENS.. 

